/* ============================================================
   QQ Technology — Studio site styles
   Built on the QQ design tokens (assets/colors_and_type.css)
   ============================================================ */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--duration-default) var(--ease-soft),
              color var(--duration-default) var(--ease-soft);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

::selection { background: var(--primary-soft); color: var(--fg); }

a { color: inherit; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 920px; margin: 0 auto; padding: 0 32px; }

/* ---------- Accent variants (Tweaks) ---------- */
:root[data-accent="sage"]  { --primary: var(--sage-400);  --primary-hover: var(--sage-500); --primary-soft: var(--sage-100); }
:root[data-accent="ochre"] { --primary: var(--ochre-400); --primary-hover: var(--ochre-500); --primary-soft: var(--ochre-100); }
:root[data-accent="plum"]  { --primary: var(--plum-400);  --primary-hover: var(--plum-500); --primary-soft: var(--plum-100); }

:root[data-theme="dark"][data-accent="sage"]  { --primary: var(--sage-600);  --primary-hover: var(--sage-400); --primary-soft: rgba(147,184,136,0.15); }
:root[data-theme="dark"][data-accent="ochre"] { --primary: var(--ochre-600); --primary-hover: var(--ochre-400); --primary-soft: rgba(229,195,107,0.15); }
:root[data-theme="dark"][data-accent="plum"]  { --primary: var(--plum-600);  --primary-hover: var(--plum-400); --primary-soft: rgba(184,139,160,0.15); }

/* ============================================================
   Type helpers
   ============================================================ */
.eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow .tick { width: 22px; height: 1px; background: var(--primary); display: inline-block; }

.display {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--fg);
  margin: 0;
}
.display em { font-style: italic; color: var(--primary); }

.serif-h2 {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
}
.serif-h2 em { font-style: italic; color: var(--primary); }

.lead {
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--fg-muted);
  margin: 0;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--fg-subtle);
  letter-spacing: 0.02em;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  font-family: var(--font-sans);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background var(--duration-micro) var(--ease-soft),
              color var(--duration-micro) var(--ease-soft),
              transform var(--duration-micro) var(--ease-soft),
              box-shadow var(--duration-micro) var(--ease-soft),
              border-color var(--duration-micro) var(--ease-soft);
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn:active { transform: scale(0.98); }

.btn-primary { background: var(--primary); color: var(--fg-on-clay); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary { background: var(--bg-elevated); color: var(--fg); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--border-strong); }

.btn-ghost { background: transparent; color: var(--fg); }
.btn-ghost:hover { background: var(--bg-subtle); }

.btn-lg { padding: 15px 28px; font-size: var(--text-base); }

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 14px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 30px; height: 30px; display: block; }
.brand .wordmark {
  font-family: var(--font-display); font-size: 22px; color: var(--fg);
  letter-spacing: -0.01em; line-height: 1; white-space: nowrap;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: var(--text-sm); font-weight: var(--weight-medium);
  color: var(--fg-muted); text-decoration: none; position: relative;
  transition: color var(--duration-micro) var(--ease-soft);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -4px; height: 1.5px; width: 0;
  background: var(--primary); transition: width var(--duration-default) var(--ease-soft);
}
.nav-links a:hover { color: var(--fg); }
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 38px; height: 38px; border-radius: var(--radius-full);
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--border); color: var(--fg);
  cursor: pointer; transition: background var(--duration-micro) var(--ease-soft),
              border-color var(--duration-micro) var(--ease-soft);
}
.icon-btn:hover { background: var(--bg-subtle); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-sun { display: none; }
:root[data-theme="dark"] .theme-sun { display: block; }
:root[data-theme="dark"] .theme-moon { display: none; }

.brand .mark-dark { display: none; }
:root[data-theme="dark"] .brand .mark-light { display: none; }
:root[data-theme="dark"] .brand .mark-dark { display: block; }

.nav-menu-btn { display: none; }

/* ============================================================
   Hero
   ============================================================ */
.hero { padding: clamp(64px, 11vw, 128px) 0 clamp(56px, 8vw, 96px); }
.hero-inner { max-width: 980px; }
.hero.center .hero-inner { margin: 0 auto; text-align: center; }
.hero.center .hero-meta { justify-content: center; }
.hero.center .hero-cta { justify-content: center; }
.hero h1 { font-size: clamp(2.75rem, 7vw, 5.5rem); margin: 22px 0 0; }
.hero .lead { margin-top: 28px; max-width: 620px; font-size: var(--text-lg); }
.hero.center .lead { margin-left: auto; margin-right: auto; }
.hero-cta { display: flex; gap: 12px; margin-top: 36px; flex-wrap: wrap; }
.hero-meta {
  display: flex; gap: 40px; margin-top: 56px; flex-wrap: wrap;
  padding-top: 32px; border-top: 1px solid var(--border);
}
.hero-meta .stat .n {
  font-family: var(--font-display); font-size: var(--text-2xl);
  color: var(--fg); line-height: 1; letter-spacing: -0.02em;
}
.hero-meta .stat .l {
  font-size: var(--text-xs); color: var(--fg-muted); margin-top: 8px;
  letter-spacing: var(--tracking-caps); text-transform: uppercase; font-weight: var(--weight-bold);
}

/* ============================================================
   Section scaffolding
   ============================================================ */
.section { padding: clamp(64px, 9vw, 110px) 0; }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head .serif-h2 { margin-top: 14px; }
.section-head .lead { margin-top: 18px; }

.band-dark {
  background: var(--earth-900);
  color: var(--cream-100);
}
.band-dark .serif-h2,
.band-dark .display { color: var(--cream-50); }
.band-dark .lead { color: var(--earth-300); }
.band-dark .eyebrow { color: var(--earth-300); }
.band-subtle { background: var(--bg-subtle); }

/* ============================================================
   What we build
   ============================================================ */
.build-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 64px; align-items: start; }
.disciplines { display: flex; flex-direction: column; }
.discipline {
  display: grid; grid-template-columns: 56px 1fr auto; gap: 22px; align-items: center;
  padding: 26px 4px; border-top: 1px solid var(--border);
  transition: padding-left var(--duration-default) var(--ease-soft);
}
.discipline:last-child { border-bottom: 1px solid var(--border); }
.discipline:hover { padding-left: 14px; }
.discipline .ic {
  width: 52px; height: 52px; border-radius: var(--radius-lg);
  background: var(--primary-soft); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.discipline .ic svg { width: 24px; height: 24px; }
.discipline h3 {
  font-family: var(--font-sans); font-size: var(--text-lg); font-weight: var(--weight-semibold);
  margin: 0 0 4px; color: var(--fg); letter-spacing: -0.01em;
}
.discipline p { margin: 0; font-size: var(--text-sm); color: var(--fg-muted); line-height: var(--leading-normal); max-width: 460px; }
.discipline .num { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--fg-subtle); }

/* ============================================================
   Work / portfolio
   ============================================================ */
.work-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; flex-wrap: wrap; margin-bottom: 40px; }
.filters { display: flex; gap: 8px; flex-wrap: wrap; }
.filter {
  font-family: var(--font-sans); font-size: var(--text-sm); font-weight: var(--weight-semibold);
  padding: 8px 16px; border-radius: var(--radius-full);
  background: transparent; color: var(--fg-muted); border: 1px solid var(--border);
  cursor: pointer; transition: all var(--duration-micro) var(--ease-soft);
}
.filter:hover { color: var(--fg); border-color: var(--border-strong); }
.filter.active { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.work-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  display: flex; flex-direction: column;
  transition: transform var(--duration-default) var(--ease-soft),
              box-shadow var(--duration-default) var(--ease-soft),
              opacity var(--duration-default) var(--ease-soft);
}
:root[data-theme="dark"] .card { border-color: var(--border); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card.hide { display: none; }

.card .cover { aspect-ratio: 16 / 10; width: 100%; display: block; position: relative; overflow: hidden; }
.card .cover svg { width: 100%; height: 100%; display: block; }
.card .cover .badge {
  position: absolute; top: 16px; left: 16px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em;
  padding: 5px 10px; border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  backdrop-filter: blur(6px); color: var(--fg); font-weight: 500;
}
.card-body { padding: 24px 26px 26px; display: flex; flex-direction: column; flex: 1; }
.card-body .cat {
  font-size: var(--text-xs); font-weight: var(--weight-bold); letter-spacing: var(--tracking-caps);
  text-transform: uppercase; margin: 0 0 10px;
}
.card-body h3 {
  font-family: var(--font-display); font-size: var(--text-xl); font-weight: var(--weight-regular);
  margin: 0 0 8px; color: var(--fg); letter-spacing: -0.01em; line-height: 1.1;
}
.card-body p { margin: 0; font-size: var(--text-sm); color: var(--fg-muted); line-height: var(--leading-normal); }
.card-foot {
  margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.card-foot .metric { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--fg); }
.card-foot .view {
  display: inline-flex; align-items: center; gap: 6px; font-size: var(--text-sm);
  font-weight: var(--weight-semibold); color: var(--primary);
  opacity: 0; transform: translateX(-6px);
  transition: opacity var(--duration-default) var(--ease-soft), transform var(--duration-default) var(--ease-soft);
}
.card-foot .view svg { width: 15px; height: 15px; }
.card:hover .view { opacity: 1; transform: translateX(0); }

/* In-progress project status (v2) */
.card-foot .prog { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.card-foot .prog-bar { width: 120px; max-width: 100%; height: 5px; background: var(--bg-inset); border-radius: var(--radius-full); overflow: hidden; }
.card-foot .prog-bar > span { display: block; height: 100%; background: var(--primary); border-radius: var(--radius-full); }
.card-foot .prog-label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--fg-muted); letter-spacing: 0.02em; }
.card-foot .target { font-size: var(--text-sm); font-weight: var(--weight-semibold); color: var(--fg-subtle); white-space: nowrap; }

/* ============================================================
   Vietnam band
   ============================================================ */
.vn { display: grid; grid-template-columns: 1.2fr 1fr; gap: 72px; align-items: center; }
.vn h2 { margin-top: 18px; }
.vn .lead { margin-top: 22px; }
.vn-coords {
  margin-top: 32px; display: inline-flex; flex-direction: column; gap: 4px;
  font-family: var(--font-mono); font-size: var(--text-sm); color: var(--earth-300);
}
.vn-coords .row { display: flex; gap: 14px; }
.vn-coords .row .k { color: var(--primary); width: 64px; }
.vn-visual {
  aspect-ratio: 1; border-radius: var(--radius-2xl); overflow: hidden;
  background: var(--earth-950); border: 1px solid var(--earth-700);
  display: flex; align-items: center; justify-content: center; position: relative;
}
.vn-visual svg { width: 100%; height: 100%; }

/* ============================================================
   Stats
   ============================================================ */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card {
  padding: 32px 28px; border-radius: var(--radius-lg);
  background: var(--bg-elevated); border: 1px solid var(--border);
}
.stat-card .v {
  font-family: var(--font-display); font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1; letter-spacing: -0.02em; color: var(--fg);
}
.stat-card .v .suffix { color: var(--primary); }
.stat-card .k {
  margin-top: 14px; font-size: var(--text-sm); color: var(--fg-muted); line-height: var(--leading-normal);
}

/* ============================================================
   Contact
   ============================================================ */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: start; }
.contact-left h2 { margin-top: 16px; }
.contact-left .lead { margin-top: 20px; max-width: 420px; }
.contact-detail { margin-top: 36px; display: flex; flex-direction: column; gap: 22px; }
.contact-detail .item { display: flex; gap: 14px; align-items: flex-start; }
.contact-detail .item .ic { color: var(--primary); margin-top: 2px; flex-shrink: 0; }
.contact-detail .item .ic svg { width: 20px; height: 20px; }
.contact-detail .item .k { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: var(--tracking-caps); font-weight: var(--weight-bold); color: var(--fg-muted); margin: 0 0 3px; }
.contact-detail .item .vv { font-size: var(--text-base); color: var(--fg); margin: 0; }
.contact-detail .item a { text-decoration: none; }
.contact-detail .item a:hover { color: var(--primary); }

.form { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 32px; box-shadow: var(--shadow-sm); }
.field { margin-bottom: 20px; }
.field label {
  display: block; font-size: var(--text-sm); font-weight: var(--weight-semibold);
  color: var(--fg); margin-bottom: 8px;
}
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--bg-inset); color: var(--fg);
  font-family: var(--font-sans); font-size: var(--text-base); outline: none;
  transition: border-color var(--duration-micro) var(--ease-soft), box-shadow var(--duration-micro) var(--ease-soft);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--primary-soft);
}
.field.err input, .field.err textarea, .field.err select { border-color: var(--danger); }
.field .msg { font-size: var(--text-xs); color: var(--danger); margin-top: 6px; display: none; }
.field.err .msg { display: block; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form .btn-primary { width: 100%; justify-content: center; margin-top: 4px; }
.form-success {
  display: none; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; min-height: 360px; gap: 14px;
}
.form-success .ic { width: 60px; height: 60px; border-radius: var(--radius-full); background: var(--success-soft); color: var(--success); display: flex; align-items: center; justify-content: center; }
.form-success .ic svg { width: 28px; height: 28px; }
.form-success h3 { font-family: var(--font-display); font-weight: 400; font-size: var(--text-2xl); margin: 0; color: var(--fg); }
.form-success p { margin: 0; color: var(--fg-muted); max-width: 320px; }
.form.sent .form-body { display: none; }
.form.sent .form-success { display: flex; }

/* Submit error (shown when the network/Formspree request fails) */
.form-error-msg {
  display: none; margin: 14px 0 0; padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--danger-soft); color: var(--danger);
  font-size: var(--text-sm); line-height: var(--leading-normal);
}
.form-error-msg a { font-weight: var(--weight-semibold); }
.form.error .form-error-msg { display: block; }
.form button[type="submit"][disabled] { opacity: 0.6; cursor: progress; }

/* ============================================================
   Footer
   ============================================================ */
.footer { background: var(--earth-900); color: var(--cream-100); padding: 72px 0 40px; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer .brand .wordmark { color: var(--cream-50); }
.footer-col h4 {
  font-size: var(--text-xs); font-weight: var(--weight-bold); letter-spacing: var(--tracking-caps);
  text-transform: uppercase; color: var(--earth-300); margin: 0 0 16px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: var(--text-sm); color: var(--cream-100); text-decoration: none; opacity: 0.85; }
.footer-col a:hover { opacity: 1; color: var(--clay-700); }
.footer .tagline { font-size: var(--text-sm); color: var(--earth-300); max-width: 300px; line-height: var(--leading-normal); margin: 16px 0 0; }
.footer-bottom {
  border-top: 1px solid var(--earth-700); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  font-size: var(--text-sm); color: var(--earth-400);
}
.footer-bottom .links { display: flex; gap: 20px; }
.footer-bottom a { color: var(--earth-400); text-decoration: none; }
.footer-bottom a:hover { color: var(--cream-100); }

/* ============================================================
   Scroll reveal
   ============================================================ */
.reveal { opacity: 0; transform: translateY(20px); }
.reveal.in { opacity: 1; transform: none; animation: qqReveal 600ms var(--ease-soft) both; }
@keyframes qqReveal {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: none; }
}
.no-motion .reveal { opacity: 1 !important; transform: none !important; animation: none !important; }

/* ============================================================
   Tweaks panel
   ============================================================ */
.tweaks {
  position: fixed; right: 20px; bottom: 20px; z-index: 200; width: 280px;
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl); padding: 18px; display: none;
  font-family: var(--font-sans);
}
.tweaks.show { display: block; }
.tweaks-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.tweaks-head h4 { margin: 0; font-family: var(--font-display); font-weight: 400; font-size: var(--text-lg); color: var(--fg); }
.tweaks-head button { all: unset; cursor: pointer; color: var(--fg-muted); display: flex; padding: 4px; border-radius: var(--radius-sm); }
.tweaks-head button:hover { background: var(--bg-subtle); color: var(--fg); }
.tweak-group { margin-bottom: 16px; }
.tweak-group > .lbl { font-size: var(--text-xs); font-weight: var(--weight-bold); letter-spacing: var(--tracking-caps); text-transform: uppercase; color: var(--fg-muted); margin-bottom: 8px; }
.swatches { display: flex; gap: 8px; }
.swatch { width: 34px; height: 34px; border-radius: var(--radius-full); cursor: pointer; border: 2px solid transparent; transition: transform var(--duration-micro) var(--ease-soft); position: relative; }
.swatch:hover { transform: scale(1.08); }
.swatch.active { border-color: var(--fg); }
.seg { display: flex; gap: 4px; background: var(--bg-inset); padding: 4px; border-radius: var(--radius-md); }
.seg button { flex: 1; all: unset; text-align: center; cursor: pointer; padding: 7px 0; border-radius: var(--radius-sm); font-size: var(--text-sm); font-weight: var(--weight-semibold); color: var(--fg-muted); }
.seg button.active { background: var(--bg-elevated); color: var(--fg); box-shadow: var(--shadow-sm); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 920px) {
  .build-grid, .vn, .contact { grid-template-columns: 1fr; gap: 40px; }
  .work-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .wrap, .wrap-narrow { padding: 0 20px; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-meta { gap: 28px; }
  .tweaks { left: 16px; right: 16px; width: auto; }
}